SonyEricsson Xperia X10 | 
                                    
                                    
                                    
                                        
                                        Vivo Y21d | 
                                    
                                    
                                    
                                        
                                         
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| Build | OS | Android OS 1.6 (Donut), upgradable to Android 2.1 (Eclair) | Android 15 OS | |
| UI | Timescape UI | Funtouch 15 | ||
| Dimensions | 119 x 63 x 13 mm | 166.14 x 77.01 x 8.39 mm | ||
| Weight | 135 g | 209 g | ||
| SIM | Nano-SIM + Nano-SIM | |||
| Colors | Sensous Black, Luster White | Coral Red, Jade Green | ||
| Frequency | 2G Band | GSM 850 / 900 / 1800 / 1900 (HSDPA 900 / 1700 / 2100) | SIM1: GSM 850 / 900 / 1800 / 1900 SIM2: GSM 850 / 900 / 1800 / 1900  | 
                                                |
| 3G Band | HSDPA 850 / 900 / 2100 | |||
| 4G Band | LTE band 1(2100), 3(1800), 5(850), 8(900), 28(700), 38(2600), 40(2300), 41(2500) | |||
| Processor | CPU | 1 GHz Scorpion | Octa-Core (2 × 1.8 GHz + 6 × 1.8 GHz) | |
| Chipset | Qualcomm QSD8250 Snapdragon | Unisoc T7225 (12 nm) | ||
| GPU | Adreno 200 | Arm Mali G57 | ||
| Display | Technology | TFT capacitive touchscreen, 65K colors | IPS LCD Capacitive Touchscreen | |
| Size | 4.0 inches | 6.68 Inches | ||
| Resolution | 480 x 854 pixels | 720 x 1608 Pixels (~264 PPI) | ||
| Protection | Scratch-resistant surface | |||
| Extra Features | 90Hz, 1000 nits Brightness | |||
| Memory | Built-in | 1GB built-in, 384MB RAM | 128GB Built-in, 6GB RAM, eMMC 5.1 | |
| Card | microSD included (supports up to 32GB) | microSD Card, (supports up to 2TB) | ||
| SMS | ||||
| Camera | Main | 8MP, 3264x2448 pixels, autofocus | Dual Camera: 50 MP, f/1.8 + 0.08 MP, f/2.2, LED Flash | |
| Features | Touch focus, image stabilization, geo-tagging, face and smile detection, Video (WVGA 30fps), (720p 30fps with cont. autofocus via Android 2.1 Eclair update) | Night, Portrait, Video, Live Photo, Slo-mo, Time-lapse, Panorama, Video | ||
| Front | No | 5 MP | ||
| Connectivity | WLAN | Wi-Fi 802.11b/g, DLNA | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Bluetooth | v2.1 with A2DP | v5.2 with A2DP, LE | ||
| GPS | Yes + A-GPS support | Yes + A-GPS support & Glonass, BDS, GALILEO, QZSS | ||
| Radio | No | FM Radio | ||
| USB | Yes | USB Type-C 2.0, OTG | ||
| Infrared | ||||
| Data | GPRS Class 10 (48 kbps), EDGE Class 10 (236.8 kbps), 3G (HSDPA 7.2 Mbps, HSUPA 2 Mbps) | 2G GSM, 3G HSPA, 4G LTE | ||
| Features | Sensors | Accelerometer, Proximity | Accelerometer, Gyro, Compass, Proximity, FingerPrint | |
| Audio | 3.5mm audio jack, Speakerphone | 3.5mm Audio Jack, Speaker Phone | ||
| Browser | HTML | HTML5 | ||
| Messaging | SMS, MMS, Email, Push email, IM | SMS(threaded view), MMS, Email, Push Mail, IM | ||
| Games | built-in | Built-in + Downloadable | ||
| Torch | No | Yes | ||
| Extra | Google Search, Maps, Gmail, Document viewer, Voice memo, Digital compass, Speakerphone | Document viewer, Photo/video editor | ||
| Battery | Capacity | Li-ion 6500 mAh | ||
| Standby | Up to 415 h | |||
| Talktime | Up to 10 h | |||
| - | - Fast charging 44W | |||
| Price | in Rupees | Rs. Discontinued | Rs. 43,999 | |
| in USD | $0 | $422 |